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Once that's in place, you will need to restart the SMTP agent, on every Netmail Secure appliance, which you can do at a shell prompt with the following command: /opt/ma/netmail/sbin/launcher -e "restart smtpd"
Or you can restart all services with: systemctl restart netmail


To undo, change the attribute value to 'AllowLongBodyLines:0' and restart the agent/service again.